<template>
  <div>
    <el-upload
      :action="uploadUrl"
      :before-upload="handleBeforeUpload"
      :on-success="handleUploadSuccess"
      :on-error="handleUploadError"
      name="file"
      :show-file-list="false"
      :headers="headers"
      :placeholder-txt="placeholderTxt"
      style="display: none"
      ref="uploadRef"
      v-if="type == 'url'"
    >
    </el-upload>
    <div class="editor" ref="editorRef" :style="styles"></div>
  </div>
</template>

<script setup lang="ts">
import { ref, computed, onMounted, onBeforeUnmount, watch, nextTick } from 'vue'
import Quill from 'quill'
import 'quill/dist/quill.core.css'
import 'quill/dist/quill.snow.css'
import 'quill/dist/quill.bubble.css'
import { getToken } from '@/utils/auth'
import { ElMessage, type UploadInstance, type UploadFile, type UploadFiles } from 'element-plus'

// 定义Props
interface Props {
  /* 编辑器的内容 */
  value?: string
  /* 高度 */
  height?: number
  /* 最小高度 */
  minHeight?: number
  /* 只读 */
  readOnly?: boolean
  /* 上传文件大小限制(MB) */
  fileSize?: number
  /* 类型（base64格式、url格式） */
  type?: string
  /* 占位符文本 */
  placeholderTxt?: string
}

const props = withDefaults(defineProps<Props>(), {
  value: '',
  height: undefined,
  minHeight: undefined,
  readOnly: false,
  fileSize: 5,
  type: 'url',
  placeholderTxt: '请输入内容',
})

// 定义Emits
const emit = defineEmits<{
  (e: 'input', value: string): void
  (e: 'on-change', data: { html: string; text: string; quill: Quill | null }): void
  (e: 'on-text-change', delta: any, oldDelta: any, source: any): void
  (e: 'on-selection-change', range: any, oldRange: any, source: any): void
  (e: 'on-editor-change', eventName: string, ...args: any[]): void
}>()

// 上传的图片服务器地址
const uploadUrl = import.meta.env.VITE_APP_BASE_API + '/file/upload'

const headers = {
  Authorization: 'Bearer ' + getToken(),
}

// Refs
const uploadRef = ref<UploadInstance>()
const editorRef = ref<HTMLDivElement>()
const quillRef = ref<Quill | null>(null)
const currentValue = ref('')

// Options
const options = computed(() => ({
  theme: 'snow',
  bounds: document.body,
  debug: 'warn' as const,
  modules: {
    // 工具栏配置
    toolbar: [
      ['bold', 'italic', 'underline', 'strike'], // 加粗 斜体 下划线 删除线
      ['blockquote', 'code-block'], // 引用  代码块
      [{ list: 'ordered' }, { list: 'bullet' }], // 有序、无序列表
      [{ indent: '-1' }, { indent: '+1' }], // 缩进
      [{ size: ['small', false, 'large', 'huge'] }], // 字体大小
      [{ header: [1, 2, 3, 4, 5, 6, false] }], // 标题
      [{ color: [] }, { background: [] }], // 字体颜色、字体背景颜色
      [{ align: [] }], // 对齐方式
      ['clean'], // 清除文本格式
      ['link', 'image', 'video'], // 链接、图片、视频
    ],
  },
  placeholder: props.placeholderTxt,
  readOnly: props.readOnly,
}))

const styles = computed(() => {
  const style: { [key: string]: string } = {}
  if (props.minHeight) {
    style.minHeight = `${props.minHeight}px`
  }
  if (props.height) {
    style.height = `${props.height}px`
  }
  return style
})

// Watch value
watch(
  () => props.value,
  (val) => {
    if (val !== currentValue.value) {
      currentValue.value = val === null ? '' : val
      if (quillRef.value) {
        quillRef.value.clipboard.dangerouslyPasteHTML(currentValue.value)
      }
    }
  },
  { immediate: true },
)

// 初始化
const init = () => {
  if (!editorRef.value) return

  quillRef.value = new Quill(editorRef.value, options.value)

  // 如果设置了上传地址则自定义图片上传事件
  if (props.type == 'url' && quillRef.value) {
    const toolbar: any = quillRef.value.getModule('toolbar')
    toolbar.addHandler('image', (value: boolean) => {
      if (value) {
        // 使用 nextTick 确保 DOM 更新后再执行
        nextTick(() => {
          if (uploadRef.value?.$el) {
            const input = uploadRef.value.$el.querySelector('input[type="file"]')
            if (input) {
              input.click()
            }
          }
        })
      } else {
        quillRef.value!.format('image', false)
      }
    })
  }

  if (quillRef.value) {
    quillRef.value.clipboard.dangerouslyPasteHTML(currentValue.value)
    quillRef.value.on('text-change', (delta, oldDelta, source) => {
      if (editorRef.value?.children[0] && quillRef.value) {
        const html = editorRef.value.children[0].innerHTML
        const text = quillRef.value.getText()
        const quill = quillRef.value
        currentValue.value = html
        emit('input', html)
        emit('on-change', { html, text, quill: quill as Quill | null })
      }
    })

    quillRef.value.on('text-change', (delta, oldDelta, source) => {
      emit('on-text-change', delta, oldDelta, source)
    })

    quillRef.value.on('selection-change', (range, oldRange, source) => {
      emit('on-selection-change', range, oldRange, source)
    })

    quillRef.value.on('editor-change', (eventName, ...args) => {
      emit('on-editor-change', eventName, ...args)
    })
  }
}

// 上传前校检格式和大小
const handleBeforeUpload = (file: File) => {
  const type = ['image/jpeg', 'image/jpg', 'image/png', 'image/svg']
  const isJPG = type.includes(file.type)
  // 检验文件格式
  if (!isJPG) {
    ElMessage.error(`图片格式错误!`)
    return false
  }
  // 校检文件大小
  if (props.fileSize) {
    const isLt = file.size / 1024 / 1024 < props.fileSize
    if (!isLt) {
      ElMessage.error(`上传文件大小不能超过 ${props.fileSize} MB!`)
      return false
    }
  }
  return true
}

const handleUploadSuccess = (res: any, file: UploadFile, files: UploadFiles) => {
  // 如果上传成功
  if (res.code == 200) {
    // 获取富文本组件实例
    const quill = quillRef.value
    if (!quill) return

    // 获取光标所在位置
    const length = quill.getSelection()?.index || 0
    // 插入图片  res.url为服务器返回的图片地址
    quill.insertEmbed(length, 'image', res.data.url)
    // 调整光标到最后
    quill.setSelection(length + 1)
  } else {
    ElMessage.error('图片插入失败')
  }
}

const handleUploadError = () => {
  ElMessage.error('图片插入失败')
}

onMounted(() => {
  init()
})

onBeforeUnmount(() => {
  quillRef.value = null
})
</script>

<style>
.editor,
.ql-toolbar {
  white-space: pre-wrap !important;
  line-height: normal !important;
}
.quill-img {
  display: none;
}
.ql-snow .ql-tooltip[data-mode='link']::before {
  content: '请输入链接地址:';
}
.ql-snow .ql-tooltip.ql-editing a.ql-action::after {
  border-right: 0px;
  content: '保存';
  padding-right: 0px;
}
.ql-snow .ql-tooltip[data-mode='video']::before {
  content: '请输入视频地址:';
}
.ql-snow .ql-picker.ql-size .ql-picker-label::before,
.ql-snow .ql-picker.ql-size .ql-picker-item::before {
  content: '14px';
}
.ql-snow .ql-picker.ql-size .ql-picker-label[data-value='small']::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value='small']::before {
  content: '10px';
}
.ql-snow .ql-picker.ql-size .ql-picker-label[data-value='large']::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value='large']::before {
  content: '18px';
}
.ql-snow .ql-picker.ql-size .ql-picker-label[data-value='huge']::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value='huge']::before {
  content: '32px';
}
.ql-snow .ql-picker.ql-header .ql-picker-label::before,
.ql-snow .ql-picker.ql-header .ql-picker-item::before {
  content: '文本';
}
.ql-snow .ql-picker.ql-header .ql-picker-label[data-value='1']::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value='1']::before {
  content: '标题1';
}
.ql-snow .ql-picker.ql-header .ql-picker-label[data-value='2']::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value='2']::before {
  content: '标题2';
}
.ql-snow .ql-picker.ql-header .ql-picker-label[data-value='3']::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value='3']::before {
  content: '标题3';
}
.ql-snow .ql-picker.ql-header .ql-picker-label[data-value='4']::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value='4']::before {
  content: '标题4';
}
.ql-snow .ql-picker.ql-header .ql-picker-label[data-value='5']::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value='5']::before {
  content: '标题5';
}
.ql-snow .ql-picker.ql-header .ql-picker-label[data-value='6']::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value='6']::before {
  content: '标题6';
}
.ql-snow .ql-picker.ql-font .ql-picker-label::before,
.ql-snow .ql-picker.ql-font .ql-picker-item::before {
  content: '标准字体';
}
.ql-snow .ql-picker.ql-font .ql-picker-label[data-value='serif']::before,
.ql-snow .ql-picker.ql-font .ql-picker-item[data-value='serif']::before {
  content: '衬线字体';
}
.ql-snow .ql-picker.ql-font .ql-picker-label[data-value='monospace']::before,
.ql-snow .ql-picker.ql-font .ql-picker-item[data-value='monospace']::before {
  content: '等宽字体';
}
</style>
